Well, let's take a moment to appreciate the number 155. When we round it to the nearest whole number, it stays the same because it's already a whole number. Isn't that just lovely? Just remember, every number is special in its own way.
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150.50
9000
Oh, dude, you write 155 million as 155,000,000. It's like a whole bunch of zeros after that 155. Just keep adding zeros until you hit 155 million, and boom, you've got your number. Easy peasy, right?
155 is not a prime number, but a composite number, as it is divisible by 5 and 31.
As 155 is ending with 5 then it can be divided by 5 thus it's not a prime number 155 = 5 x 31